NEESR Planning/Collaborative Research: Toward Experimental Verification of Controllable Damping Strategies for Base Isolated Buildings

NEESR 规划/合作研究：基础隔离建筑可控阻尼策略的实验验证

• 批准号: 1344622
• 负责人: Richard Christenson
• 金额: $ 22.11万
• 依托单位: University of Connecticut
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-10-01 至 2017-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1344622&HistoricalAwards=false
• 关键词: NEESR; Planning; Collaborative; Research; Toward

The goals of this research are: (a) to leverage the investment by the Japanese National Research Institute for Earth Science and Disaster Prevention (NIED) to allow for large-scale experimental verification of smart base isolation for U.S. structures, isolators and controllable dampers, and subjected to U.S. ground motions, thereby demonstrating the robust performance provided by controllable dampers in a wide array of ground motions with diverse magnitudes and spectra, as well as with damaged structures; such adaptability is impossible with conventional passive isolation devices; (b) to accelerate innovations in real-time hybrid simulation (RTHS) experimental techniques that can serve to reduce future reliance on large-scale earthquake engineering experiments, and (c) to engage a community of researchers to study controlled base isolation through international collaboration, a benchmark study, and a project workshop. To achieve these goals, this research has five main phases: (1) design, build and test baseline numerical and small-scale experimental models of the isolated structure to be tested on the NIED E-Defense shake table; (2) derive analytical and numerical approaches to guarantee the conditions of stability of RTHS, as well as fully develop the computational techniques that exploit the localized nature of the physical components in RTHS for highly efficient simulation of large-scale numerical models for RTHS; (3) participate in E-Defense's 2015 controllable damping base isolation experiment, working with Japanese collaborators to develop suitable control strategies and assist with the challenging aspects of their experiment; (4) use the models and tools already developed, and the experience and data from the full-scale E-Defense tests, in RTHS at the University of Connecticut to demonstrate the advances in RTHS capabilities; and (5) engage the research community by designing and releasing a benchmark study in controlled isolation based on the E-Defense and U.S.-designed structures, and by a workshop to solicit community feedback about the tools and future directions of RTHS studies. Smart base isolation is a promising seismic mitigation technique that supplements a building's conventional base isolation layer with controllable energy dissipation devices that allow for seismic protection over a range of different earthquakes. This mitigation technique is now ready for full-scale experimental verification and validation: Japanese collaborators at the NIED E-Defense shake table facility in Miki, Japan, are planning experiments in 2015 of a full-scale base isolated building with controllable dampers in the isolation layer to mitigate damage and injury, particularly for strong impulsive and long-period excitation. Full-scale dynamic earthquake engineering experiments, while vital for advancing seismic protection, are limited by the few facilities with the capacity to conduct the experiments and by the associated high cost of testing. These large-scale earthquake engineering experiments can be leveraged with a wider array of real-time hybrid simulations (RTHS), which combines physical testing of the critical components linked with physics-based computational model simulations of the remaining structure. RTHS must be calibrated to the full-scale results to ensure accuracy (and credibility), must be capable of accommodating, in real-time, the large-scale computational models vital to precise response computation for complex structures, and must be guaranteed stable and robust. This research will enable new technologies for seismic hazard mitigation and hybrid computational/experimental tools that complement, and broaden the applicability of, large-scale testing. Building technology will be advanced by demonstrating, in full-scale physical and mixed physical/virtual experiments, that controllable damping devices can provide significant reductions in building motion and damage during earthquakes - and doing so by capitalizing on experiments already planned by Japanese collaborators. Further, the project will enable the computational tools to support these cyber-physical experiments for realistic large-scale building models and ensure that the results are accurate. Beyond the collaboration with Japanese researchers, the development of a controllable base isolation benchmark study using models calibrated to full-scale experimental results will engage a world-wide community of researchers to multiply the reach of this project through numerous alternate control strategies. The research results will be incorporated into graduate and undergraduate classes at the University of Southern California and the University of Connecticut. An industry advisory panel will be assembled to ensure that the knowledge of practicing engineers informs the research. A workshop will ensure the transfer of the resulting tools to the hybrid simulation community so that others can take full advantage of the research results from this project. Data from this project will be archived and made available to the public through the NEES data repository. This award is part of the National Earthquake Hazards Reduction Program (NEHRP).

这项研究的目标是：(a) 利用日本国家地球科学与防灾研究所 (NIED) 的投资，对美国结构、隔离器和可控阻尼器的智能基础隔离进行大规模实验验证，并受到美国地面运动的影响，从而展示了可控阻尼器在各种不同幅度和频谱的地面运动以及受损结构中提供的稳健性能；传统的无源隔离装置不可能具有这种适应性； (b) 加速实时混合模拟 (RTHS) 实验技术的创新，以减少未来对大规模地震工程实验的依赖，以及 (c) 吸引研究人员通过国际合作研究受控基础隔离、基准研究和项目研讨会。 为了实现这些目标，本研究分为五个主要阶段：（1）设计、构建和测试要在 NIED E-Defense 振动台上测试的隔离结构的基线数值和小规模实验模型； (2) 导出分析和数值方法来保证 RTHS 的稳定性条件，并充分开发利用 RTHS 物理组件的局部性质的计算技术，以高效模拟 RTHS 的大规模数值模型； (3) 参与E-Defense 2015年可控阻尼基础隔离实验，与日本合作者合作制定合适的控制策略并协助解决实验中的挑战性问题； (4) 使用康涅狄格大学 RTHS 已开发的模型和工具以及全面电子防御测试的经验和数据来展示 RTHS 能力的进步； (5) 通过设计和发布基于 E-Defense 和美国设计的结构的受控隔离基准研究来吸引研究界的参与，并通过研讨会征求社区对 RTHS 研究的工具和未来方向的反馈。智能基础隔震是一种很有前途的减震技术，它通过可控能量耗散装置补充了建筑物的传统基础隔震层，从而可以在一系列不同的地震中提供抗震保护。 这种缓解技术现已准备好进行全面的实验验证和验证：位于日本三木的 NIED E-Defense 振动台设施的日本合作者计划于 2015 年对一座全尺寸基础隔离建筑进行实验，隔离建筑中带有可控阻尼器层以减轻损坏和伤害，特别是对于强脉冲和长时间激励。 全面的动态地震工程实验虽然对于推进地震防护至关重要，但由于能够进行实验的设施很少以及相关的测试成本高昂而受到限制。 这些大规模地震工程实验可以与更广泛的实时混合模拟（RTHS）结合使用，该模拟将关键部件的物理测试与剩余结构的基于物理的计算模型模拟相结合。 RTHS 必须校准到全尺寸结果以确保准确性（和可信度），必须能够实时适应对复杂结构的精确响应计算至关重要的大规模计算模型，并且必须保证稳定和可靠强壮的。 这项研究将实现减轻地震灾害的新技术和混合计算/实验工具，以补充和扩大大规模测试的适用性。 通过在全面的物理和混合物理/虚拟实验中证明可控阻尼装置可以显着减少地震期间的建筑物运动和损坏，并通过利用日本合作者已经计划的实验来实现，建筑技术将得到进步。 此外，该项目将使计算工具能够支持这些网络物理实验，以实现真实的大型建筑模型，并确保结果准确。 除了与日本研究人员的合作之外，使用根据全面实验结果校准的模型来开发可控基础隔离基准研究将吸引世界各地的研究人员通过众多替代控制策略扩大该项目的影响范围。 研究成果将纳入南加州大学和康涅狄格大学的研究生和本科生课程。 将组建一个行业咨询小组，以确保执业工程师的知识为研究提供信息。 研讨会将确保将所得工具转移到混合仿真社区，以便其他人可以充分利用该项目的研究成果。该项目的数据将被存档并通过 NEES 数据存储库向公众开放。 该奖项是国家地震减灾计划（NEHRP）的一部分。